Electroreduction of nitrate ions on Pt(1 1 1) electrodes modified by copper adatoms

Molodkina, E. B.; Ehrenburg, Maria R.; Polukarov, Yu. M.; Данилов, А. И.; Souza-Garcia, Janaína; Feliu, Juan M.

doi:10.1016/j.electacta.2010.08.105

Cited by 63 publications

(43 citation statements)

References 48 publications

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“…29,46,[91][92][93][94][95][96] Thirdly, peaks corresponding to anion adsorption from impurities may overlap with the H UPD and also cause a negative shift of the onset of oxides. 10,29,35,47,[51][52][53][54][58][59][60][61][62][63][64][65]97 Lastly, the so-called double layer regime provides capacitance information associated with Pt and/or carbon black and an estimate of the roughness factor. 52,98 The impact of rotation speed, voltage range and scan rate on the ECA are discussed below.…”

Section: Resultsmentioning

confidence: 99%

“…Active ORR sites on Pt are extremely susceptible to poisoning by ppm quantities of impurity anions such as sulfate, chloride and nitrate. 54,[57][58][59][60][61][62][63][64][65] Trace chloride and sulfate impurities (ppm-ppb level) when introduced into 0.1 M HClO 4 have been shown to change CV profiles and negatively affect the ORR activity on platinum surfaces. 54,57,65,66 Even 4 ppm of chloride ions are known to result in an order of magnitude loss in the ORR activity.…”

Section: Resultsmentioning

confidence: 99%

“…The deleterious effect of the adsorption of various anions on active ORR sites of Pt is well established in the literature. 51,54,[58][59][60][61][62][63][64][65] Since the measured SA of poly-Pt will be impacted by the impurities in the electrolyte, we evaluated perchloric acid from 8 sources/suppliers as listed in Experimental section; the criterion for down-selections was based on the magnitude of the measured poly-Pt SA. Table I is ) and Veritas Doubly Distilled that resulted in the highest SA, the other five grades resulted in SAs that were comparable as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Shinozaki

Zack

Richards

et al. 2015

J. Electrochem. Soc.

312

351

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The rotating disk electrode (RDE) technique is being extensively used as a screening tool to estimate the activity of novel PEMFC electrocatalysts synthesized in lab-scale (mg) quantities. Discrepancies in measured activity attributable to glassware and electrolyte impurity levels, as well as conditioning, protocols and corrections are prevalent in the literature. The electrochemical response to a broad spectrum of commercially sourced perchloric acid and the effect of acid molarity on impurity levels and solution resistance were also assessed. Our findings reveal that an area specific activity (SA) exceeding 2.0 mA/cm 2 (20 mV/s, 25 • C, 100 kPa, 0.1 M HClO 4 ) for polished poly-Pt is an indicator of impurity levels that do not impede the accurate measurement of the ORR activity of Pt based catalysts. After exploring various conditioning protocols to approach maximum utilization of the electrochemical area (ECA) and peak ORR activity without introducing catalyst degradation, an investigation of measurement protocols for ECA and ORR activity was conducted. Down-selected protocols were based on the criteria of reproducibility, duration of experiments, impurity effects and magnitude of pseudo-capacitive background correction. Statistical reproducibility of ORR activity for poly-Pt and Pt supported on high surface area carbon was demonstrated.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Shinozaki

Zack

Richards

et al. 2015

J. Electrochem. Soc.

312

351

View full text Add to dashboard Cite

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“…[1][2][3]. Attention to these processes does not wane due to its fundamental and applied importance.…”

Section: Introductionmentioning

confidence: 99%

Redox transformations of adsorbed NO molecules on a Pt(100) electrode

et al. 2013

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Electrochemical behaviour of adsorbed NO molecules on Pt(100) electrode has been studied in perchloric acid solutions by means of cyclic voltammetry. According to literature data, saturated NO adlayer with coverage of ca. 0.5 ML is formed at open circuit conditions in nitrite solution as a result of disproportion reaction. The adlayer is stable in the range of 0.4-0.9 V, NO molecules are oxidized at 0.9-1.1 V and can be reduced to ammonia at potentials less than 0.4 V. Stability of the adlayer depends on surface coverage and extent of the ordering. Unsaturated NO adlayer demonstrates redox transformations NO↔NH 3 at 0.5-0.8 V.

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“…Consequently, there is a possibility to establish a correlation between the structure of adsorption sites and their catalytic activity [17][18][19][20][21][22][23][24][25][26][27][28][29]. Our previous studies of nitrate reduction on Pt(111) and Pt(111) + Cu electrodes [22] have shown that sulfate anions block the adsorption sites on the surface of the modified electrode, thus hindering the adsorption of nitrate anions and their reduction. The extent of inhibition slightly depends on the copper adatom coverage.…”

Section: Introductionmentioning

confidence: 99%

Cu UPD at Pt(100) and stepped faces Pt(610), Pt(410) of platinum single crystal electrodes

2015

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The processes of adsorption/desorption of copper adatoms on the basal Pt(100) face and stepped Pt(610), Pt(410) surfaces have been studied in perchloric acid solution by cyclic voltammetry. It has been shown that the positions of the Cu stripping peaks are determined by perfection of the adlayer. The "island" model is suggested to describe electrochemical behavior of the Pt(hkl)+Cuad system. Obtained results are important for target modification of shape-controlled nanoparticles that are used in electrocatalysis.

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Electroreduction of nitrate ions on Pt(1 1 1) electrodes modified by copper adatoms

Cited by 63 publications

References 48 publications

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Redox transformations of adsorbed NO molecules on a Pt(100) electrode

Cu UPD at Pt(100) and stepped faces Pt(610), Pt(410) of platinum single crystal electrodes

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